Amanda Young

Amanda Young is the main protagonist and the anti-heroine of the series Jigsaw's Legacy written by Cutegirl920fire. She originally appeared in the Saw franchise as one of the hidden antagonists and was portrayed by Shawnee Smith. In Jigsaw's Legacy, instead of dying at the end of Saw III, she lives since she shoots John Kramer (who's the Jigsaw Killer and her mentor) and ends up killing him; which led to the events of Jigsaw's Legacy.

Personality
Throughout Jigsaw's Legacy, Amanda has shown signs of Borderline Personality Disorder (BPD) as seen with her mental breakdowns when Jill refuses to let her stay at her apartment and when she thinks that Jill is abandoning her. She also gets clingy on a couple of characters such as Jill and Corbett as well, resulting in a fear of them "leaving" her. Amanda also has outbursts and tends to say profanities. Her clinginess to John Kramer resulted in her having a rivalry with a fellow apprentice, Mark Hoffman, who's the antagonist of the series' first season. She also has a habit of being too close with other characters to hating their guts; but as shown with her guilt for killing John in the first episode, she still cares about others close to her if she hates them. She even takes Corbett with her after the death of the latter's parents due to feeling guilty about killing them. This is why Amanda would do anything to find Corbett after the latter gets taken by Hoffman and has a mental breakdown when the tape recorder in The Successor said that she didn't give Hoffman a chance to tell her where Corbett is and that she will rot.

Another sign of BPD she shows is self-harm. In Wanted: Part 2, she cuts her thighs with a kitchen knife from Jill's kitchen to relieve herself of the stress she had. As shown in other episodes, Amanda gets overly emotional and stressed over things such as John's death and her blackmailing letter that was written by Hoffman.

Amanda is also shown to have cleithrophobia, the fear of being trapped in a small space as shown in The Reporter and the Scout and In The Chase: Part 2. This comes from her father locking her under the stairs as a child which was revealed in the latter episode.

When by people she trusts, such as Corbett, she feels safe and "loved". This is shown when she goes to Jill's apartment in Truly Worthy after leaving Gideon Meatpacking Factory due to her being the only person she trusts.

Overall, Amanda is a mentally unstable person with unhealthy fears of abandonment, gets too clingy, but has shown remorse and cares for those close to her whether or not she hates them.

Before Becoming John's Apprentice
In her childhood, Amanda was abused and neglected by her father and that he'll lock her in the dark for hours as stated in the commentary for Saw III: Director's Cut DVD (though it was mentioned in In The Chase: Part 2 as well), which is most likely the explanation for why Amanda is mentally unstable.

When Amanda got older, she was framed for drug possession by corrupt detective Eric Matthews and was sent to prison for a certain amount of time. Her mother, Shawna disowned her as a result (revealed in Crucial Evidence). During her time in prison, Amanda became addicted to heroin. Shortly after she was released from prison, Amanda became a patient at the Homeward Bound Clinic where she met Cecil Adams and the two became a couple.

One night, Amanda convinced Cecil to try to rob the clinic; which resulted in Jill losing her unborn child, Gideon. After the events at the clinic, Amanda gets abducted by John Kramer, otherwise known as the Jigsaw Killer, and when she woke up, she finds herself in the Reverse Beartrap. She escapes the trap after she gutted her "dead" cellmate and received the key.

After her test, Amanda overcame her heroin addiction but resulted in self-harming herself as a coping mechanism. When she was interrogated by detective David Tapp, she said that Jigsaw helped her but she's still traumatized. Shortly after the interrogation, Amanda came back to her apartment when John Kramer (who was hiding in her apartment) convinced her to be his apprentice.

After Becoming John's Apprentice
John managed to convert Amanda into becoming his apprentice and gave her instructions for her first game which involved Lawrence Gordon, an oncologist, and Adam Stanheight, a photographer. A few months later, Amanda abducted Adam after entering his apartment. She took him to a bathroom that's in an underground network and chained him to a pipe. She threw a key for his chains to the bathtub before leaving the bathroom and turning the lights off. After the game ended and Adam was left to die, Amanda suffocated him as an act of mercy. She became stressed and resulted in slitting her wrists which ended up in John comforting her.

Even more months later, John targeted Eric Matthews and his apprentices including Amanda abducted Matthew's son, Daniel and six other test subjects that were framed by him. They were taken to the Nerve Gas House and Amanda played as a victim to observe the game. During the game, Amanda was thrown in the Needle Pit by Xavier (one of the test subjects) and she panicked as she looked for the key in the room. She found it and threw it out, but the pain was a vain attempt since Xavier failed to open the door before it permanently closed. Later on, Xavier realized that the combination to the safe with the antidote needed to survive the game are numbers on the back of each test subjects' necks and went mad for it. Amanda and Daniel ended up in the bathroom from the former's first game. The latter played dead and when Xavier got in the bathroom, Amanda said that he's "dead" and the numbers on their necks are needed for the safe's combination. After Xavier cuts off a piece of his neck with a knife, he approaches Amanda and ends up being killed by Daniel. Shortly afterward, Amanda subdues Daniel and injects him with the antidote; she then brought him to the Wilson Steel Plant.

Amanda returns to the bathroom and hid in the tub with a pig mask on. When Eric Matthews entered the bathroom and he sees her body, Amanda subdues him by surprise and he tried to fire at her but became unconscious. When Eric regained consciousness, he finds Amanda's audiotape on the floor and plays it. Amanda explained that she's going to carry John's legacy and that he's her first test subject. She then appears shortly after and closes the door. Even though she left Eric to die, Amanda wasn't relieved and eventually found out that he escaped. This resulted in a physical fight, which got Amanda beaten up. She managed to flee but she came back to kill him.

Amanda and John's identities were revealed after the events at the Nerve Gas House, resulting in the latter depending more and more on the former. Even though Amanda's mental stability was worsening, John was dependent on her help since he was unable to carry any games due to his cancer. Amanda ended up killing test subjects such as Troy and detective Kerry Allison since her traps were inescapable.

Right Before Jigsaw's Legacy
Since John was coming closer to death, his apprentices prepared for his final test which was at the Gideon Meatpacking Plant. Amanda did most of the work but came across Mark Hoffman who prepared a trap known as The Rack. Amanda ended up mocking Hoffman, saying that she'll stay with him forever, but Hoffman replied if she was so sure about it. She then took John to his room where they encountered Jill. Amanda was then sent to abduct Lynn Denlon, a surgeon and a test subject for John's final test.

Amanda then abducted Lynn and brought her back to the Plant as told. After getting in several arguments and even a fight, Amanda began to dislike Lynn and it was made worse when the latter was told by John that he loved her, making the former get jealous of her. Due to the stress, Amanda cuts her inner thigh with a knife to cope with it. When John was giving more attention to Lynn, it raised tensions between Amanda and Lynn. Amanda then entered the surveillance room and took a letter from her desk. The letter was written by Hoffman and threated Amanda that if she doesn't kill Lynn, John will be told that she was responsible for Gideon's death.

As a futile attempt to get revenge on Hoffman, Amanda went to the room where Corbett was held hostage and told her not to trust the person who will save her. She hoped that Corbett will tell the warning to the police and give them a clue about Hoffman.

When she returned to John's room, she aimed her gun at Lynn and shouts at John to fix her. Eventually, Jeff enters the room and the events of Jigsaw's Legacy start from there.

"Truly Worthy?"
After Jeff and Lynn reunited, Amanda thought about the letter's threat and ending up remembering the time she was in the Reverse Beartrap and how John changed her life. She then pointed her gun at John and shot him, resulting in his death. When the gunshot was fired, the Shotgun Collar that was around Lynn's neck detonated and killed her as a result. The explosion sent Jeff to a wall while Amanda fell. Jeff barely survives but ends up being killed by Amanda. Shortly afterward, Amanda rescues Corbett who was in a cell. Amanda leaves Gideon Meatpacking Plant with Corbett and arrives at Jill's apartment. When Jill opened the door, Amanda pleaded to let her in. Jill hesitates due to what Hoffman told her about Amanda but when the latter said she'll explain why she has Corbett with her if she lets her in, the former decides to let her in. In the apartment, Jill asks what happened at the meat plant but Amanda ends up having a mental breakdown. Amanda admitted to killing John since the letter told her to kill Lynn. She also admits to killing both of Corbett's parents, leaving Corbett herself in tears. Jill then asks Amanda why the letter wanted her to kill Lynn, but Amanda was unable to answer. Jill realizes that the letter probably had something to do with Gideon and asks Amanda if that's a case, where she got a yes for an answer. She then tells Amanda that she can stay at her apartment for a few nights.

Trivia

 * So far, the only episode of Jigsaw's Legacy Amanda hasn't appeared in is Confrontations even though she is also mentioned in that episode.
 * Starting with The Reporter and The Scout, certain parts of episodes are told from Amanda's perspective.